Stable isotope Dubnium (Db)

 
Isotope Mass Half-life Mode of decay Nuclear spin Nuclear magnetic moment
Db-255 255.1074 1.60 seconds α to Lr-251; SF No data available No data available
Db-256 256.1081 2.60 seconds α to Lr-252; SF; EC to Rf-256 No data available No data available
Db-257 257.1079 1.50 seconds α to Lr-253; SF; EC to Rf-257 No data available No data available
Db-258 258.1093 4.20 seconds α to Lr-254; SF; EC to Rf-258 No data available No data available
Db-259 259.1097 1.20 seconds α to Lr-255 No data available No data available
Db-260 260.1114 1.50 seconds α to Lr-256; SF; EC to Rf-260 No data available No data available
Db-261 261.1121 1.80 seconds α to Lr-257; SF No data available No data available
Db-262 262.11376 34 seconds α to Lr-258; SF; EC to Rf-262 No data available No data available
Db-263 263.1153 30 seconds α to Lr-259; SF No data available No data available
 

Properties of Dubnium

Name Dubnium
Symbol Db
Atomic number 105
Atomic weight [268]
Standard state Presumably a solid at 298 °K
CAS Registry ID 53850-35-4
Group in periodic table 5
Group name None
Period in periodic table 7
Block in periodic table d-block
Color Unknown, but probably metallic and silvery white or grey in appearance
Classification Metallic
Melting point No data available
Boiling point No data available
Density of solid 21.6 g/cm3 (predicted)
Electron configuration [Rn]5f146d37s2